enum EpubContentType {
  XHTML_1_1,
  DTBOOK,
  DTBOOK_NCX,
  OEB1_DOCUMENT,
  XML,
  CSS,
  OEB1_CSS,
  IMAGE_GIF,
  IMAGE_JPEG,
  IMAGE_PNG,
  IMAGE_SVG,
  FONT_TRUETYPE,
  FONT_OPENTYPE,
  OTHER
}
